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feat(ui): add DataTable and Toaster, drop the legacy Table, fix overlay dialogs

DataTable replaces the 20-line Table scaffold entirely: columns, sorting,
filtering, pagination, selection, bulk actions, comparison layout, sticky
first column, custom HTML cells, and a remote source driven by a `request`
output rather than a function prop (props travel as HTML attributes, so a
function arrives as its own source text).

Toaster replaces the hand-rolled status div: tone icons, actions, hover
pause/resume and a progress bar.

Overlays audit -- Modal and Drawer declared aria-modal="true" but nothing
ever moved focus into the panel, so the @keydown handler on their root
never ran and closeOnEscape did nothing. Focus, focus restore, a Tab trap
and a body scroll lock now live in the reactive runtime, shared by both.

ContextMenu placed pointer menus by subtracting a guessed 340x420 from the
viewport, which pushed every menu that was not that size away from the
pointer; it now positions at the pointer and lets the anchored clamp pull
it back once it can be measured.

The reactive runtime size budget moves 150k -> 175k to cover anchored
overlays, dialog behaviour, the toaster and the DataTable client half.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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packages/ui/component-catalog.json

@@ -168,8 +168,8 @@
     },
     {
       "name": "DataTable",
-      "category": "integrations",
-      "purpose": "Theme-aware, responsive data table component."
+      "category": "tables",
+      "purpose": "Sortable, filterable, paginated data table with row selection."
     },
     {
       "name": "DatePicker",
@@ -471,11 +471,6 @@
       "category": "forms",
       "purpose": "Theme-aware, responsive switch component."
     },
-    {
-      "name": "Table",
-      "category": "tables",
-      "purpose": "Theme-aware, responsive table component."
-    },
     {
       "name": "Tabs",
       "category": "navigation",
@@ -511,6 +506,11 @@
       "category": "integrations",
       "purpose": "Theme-aware, responsive toast notifications component."
     },
+    {
+      "name": "Toaster",
+      "category": "core",
+      "purpose": "Reusable toaster component."
+    },
     {
       "name": "ToggleCount",
       "category": "advanced-forms",